dsh-packer: Package DSH local configurations by module into standard ZIP files

# Preface After using DeepSeek Harness (DSH) for a while, the local `~/.dsh` directory accumulates a significant amount of assets: custom skills, conversation history, profile configurations, global settings, and memory data. When migrating to a new machine or reinstalling, these files are scattered across different directories, making it easy to miss items during manual collection and copying. Furthermore, when trying to share specific skills with others, it is uncertain whether the files contain local paths or secrets. dsh-packer addresses these two issues: it packages local DSH assets into standard ZIP files by module. It offers a unified pipeline covering both migration (moving the entire environment) and sharing (sending only the intended content), with privacy scanning integrated before packaging for both scenarios. # What is dsh-packer dsh-packer is DSH's "